나의 발자취

MerkleProofGas.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0; library MerkleProof { /** * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree * defined by `root`. For this, a `proof` must be provided, containing * sibling hashes on the branch from the leaf to the root of the tree. Each * pair of leaves and each pair of pre-images are assumed to be sorted. */ f..

Introduction The blockchain data structure: ordered back-linked list of blocks of tx bitcoin core client stores its metadata using Google's LevelDB. hash: SHA256 cryptographic hash algorithm Eventually, only one child block becomes part of the blockchain and the “fork” is resolved each block can have only one parent *cascade effect* The “previous block hash” field is inside the block header and ..

p2p network • extended bitcoin network: the overall network that includes the bitcoin P2P protocol, pool-mining protocols, the Stratum protocol, and any other related protocols connecting the components of the bitcoin system Node Types and Roles • functions: wallet, miner, full blockchain database, and network routing • full nodes:complete copy of the block chain vs simplified payment verificati..

xd.adobe.com/view/9b20b40f-c41a-43ff-a6cb-1bd55cd8ab1f-ce73/ 개발링크 Flow 1 37 Screens, Last modified on Oct 12, 2020 07:43 GMT xd.adobe.com xd.adobe.com/view/9b20b40f-c41a-43ff-a6cb-1bd55cd8ab1f-ce73/ Flow 1 37 Screens, Last modified on Oct 12, 2020 07:43 GMT xd.adobe.com 디자인링크

Bitcoin Core - The reference implementation bitcoin is developed by an open commu‐ nity of volunteers ; open source project Bitcoin Development Environment first, clone with git(bitcoin is an open-source) *Selecting a Bitcoin Core Release git tag : synchronize the local copy with a specific snapshot of the code repository Git checkput : To synchronize the local code with this version Git status ..

플랫폼 선정과정 Public block chain으로 한다고 제안했는데, gas fee가 발생한다. cost가 들고/안들고의 문제가 아니라 fix된것/안된것이 문제. public block chain은 TCO(Total Cost Ownership)가 자꾸 변한다. public block chain 사용은 risk가 있다.  private block chain으로 충분히 가능함. ex)이더리움 테스트넷 블록체인의 trust level 높이는 서비스를 위해서 public chain을 선택한것이라면  private chain, enterprise형 서비스를 사용하면 가능하다. 자사(람다)의 universe라는 프로그램이 있다. 자사측에서 지원을 해주겠다. 서비스가 중심이고 기술은 단지 요소이다(블록체인=기..

Transactions, Blocks, Mining, and the Blockchain Bitcoin system: based on decentralized trust interactions of different participants “trusted” in bitcoin, trust is achieved as an emergent property from the interactions of different participants in the bitcoin system. a high level by tracking a single transaction through the bitcoin system and watch as it becomes “trusted” and accepted by the bit..